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Load Connections
The generator data plate gives voltage, current and frequency rating
of the generator.
An AC wiring decal is affixed to the inside of the
louvered cover on the generator
end.
A diagram of the various AC
vol tage connect ions is prov ided on the decal and is simi lar to the
figure
on the following page.
The
generator
is
single-phase,
reconnectable
120
VAC
two-wire
or
120/240 VAC three-wire, at 60
Hertz~
or 110 VAC two-wire, 110/220 VAC
three-wire, or 220 VAC two-wire, at 50 Hertz.
Refer to specifications
section for ratings.
NOTE:
When changing the frequency produced by the generator,
an eng ine speed adjustment must be made and the connections
on the AC output terminal block, located under the louvered
cover on the back end of the generator, also must be changed
according to the AC wiring diagram.
When the generator
is
wired
for
120/240 Volts
(110/220 Volts)
and
loads are applied to the 120-Volt (llO-volt) legs, these loads must be
as balanced as possible.
A load applied to one of the two 120-Volt
(llO-Volt)
output legs while none is applied to the other, will pro-
duce
a voltage difference between the two 120-Volt (llO-Volt) output
legs.
The voltage on the loaded leg will go down and that on the
unloaded leg will go up.
The severity of this voltage difference will
depend on the amount of load applied to the one 120-Volt (llO-Volt)
leg.
Heavy loads applied to one leg will cause the generator to per-
form as above and also produce
a
rattling/growling
noise
from
the
generator end.
The noise results from the unbalanced effect produced
on the rotating field as its magnetic field passes through the loaded
and unloaded stator 120-Volt (llO-Volt) output windings.
NOTE:
It
is
recommended
that
the
installer
provide
AC
ammeters (optional) so that the operator can observe the load
being taken off each leg of the generator.
A circuit breaker should be installed between the generator and the
AC load.
This circuit breaker should be rated for
the generator's
AC output and react to overloads quickly, subject to motor starting
considerations.
22
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